A nickel-zinc ferrite material, a preparation method and application thereof

Abstract

The present application relates to soft magnetic ferrite material technical field, specifically relates to a kind of nickel-zinc ferrite material and its preparation method and application.The present application provides a kind of nickel-zinc ferrite material, raw material includes: main component, secondary component;Wherein main component includes: Fe2O3, NiO, ZnO, CuO;Fe2O3 It is 64.05~68.72wt% of the mass percentage of main component, NiO It is 14.12~17.36wt% of the mass percentage of main component, ZnO It is 11.61~15.02wt% of the mass percentage of main component, CuO It is 3.82~4.45wt% of the mass percentage of main component;With the total weight of main component, secondary component includes: Al2O30.2~0.6wt%、SiO20.05~0.25wt%、MnO2 0.1~0.35wt%.By selecting specific main component and secondary component, and limiting its respective content, so that the synergistic effect between components is generated, and finally the nickel-zinc ferrite material with excellent comprehensive performance is obtained.

Description

Technical Field

[0001] This invention relates to the field of soft magnetic ferrite materials technology, specifically to a nickel-zinc ferrite material, its preparation method, and its application. Background Technology

[0002] Ferrite materials are a new type of non-metallic magnetic material developed in the 1940s. They are generally classified into manganese-zinc and nickel-zinc materials and are widely used in the module design of power supplies and communication circuits, serving as transformers, inductors, current transformers, and filters. With the development of microelectronics technology, integration levels are constantly increasing, moving towards higher frequencies, lighter weights, smaller sizes, thinner profiles, and higher reliability, performance, and speed. Soft magnetic materials, as the main raw materials for electronic component production, are subject to increasingly higher performance requirements, especially in high-precision and reliable engineering applications, where they are required to possess high frequency, high saturation magnetic flux density, and low loss characteristics.

[0003] Nickel-zinc ferrites are widely used in various medium- and high-frequency inductors, filters, transformers, high-frequency antennas, and shortwave high-frequency communications due to their high permeability, high resistivity, high-frequency characteristics, and strong suppression of high-frequency interference. Especially in the increasingly powerful aerospace and military industries, while meeting the requirements of high frequency, miniaturization, and lightweighting, ferrite materials are required to have higher Curie temperatures and lower losses.

[0004] Major companies and institutions attach great importance to the development of high-frequency NiZn materials, such as TDK's L18F material (permeability 200, Bs only 320, Curie temperature only 180 degrees Celsius); Hitachi Metals' DM-1 material (permeability 200, Bs only 230, Curie temperature 200 degrees Celsius); ACME's H5R material (permeability 200, Bs 400, Curie temperature 200 degrees Celsius); and Huayou's D3H material (permeability 200, Bs only 320, Curie temperature only 180 degrees Celsius). 330 (Curie temperature is 200 degrees); Fengyi Company's F8 material (permeability 200, Bs 370, Curie temperature 250 degrees); Tiantong's TN20H (permeability 200, Bs 430, Curie temperature 300 degrees) has a high Curie temperature, but Bs still cannot meet the DC superposition requirements. For ferrite materials, it is relatively easy to meet only one performance parameter, such as permeability, Bs, or Curie temperature, but it is more difficult to meet multiple characteristics at the same time.

[0005] Chinese patent application number 201110451252.2 discloses a high Ui and high Curie temperature magnesium-zinc ferrite material and its preparation method. The main formula of this patent, by molar fraction, is: iron oxide Fe2O3 47.5-49.5 mol%, zinc oxide ZnO2 3.5-28.2 mol%, magnesium oxide MgO 17-20.3 mol%, and copper oxide CuO 4-8 mol%. Its permeability is 1800±25%, which cannot meet the customer's requirements for high Bs and high Curie temperature performance inductors.

[0006] Chinese patent application number 201110314150.6 discloses a high-strength, heat-shock-resistant nickel-core ferrite and its preparation method. The main components of this nickel-core ferrite, calculated as oxides, are: Fe₂O₃ 45–52 mol%, NiO 20–39 mol%, ZnO 20–30 mol%, CuO 3–6.5 mol%, with auxiliary components of SiO₂ 0.8–1.5 wt%, CaCO₃ 0.2–0.5 wt%, V₂O₅ 0.05–0.19 wt%, and Co₂O₃ 0.01–0.09 wt%. This patent has a permeability of 200 ± 25%, which cannot meet customers' requirements for high Bs and high Curie temperature performance inductors.

[0007] A Chinese patent document discloses "a manganese-zinc ferrite material for EMI suppression and its preparation method", with application publication number CN105541316A. This invention has characteristics such as high Bs and high Tc, but its high-frequency performance is poor and it cannot be used in high-frequency environments above 10MHz, and its surface resistance is low.

[0008] In summary, the main problem with nickel-zinc ferrite materials in related technologies is that it is difficult to simultaneously achieve high permeability, Curie temperature, saturation magnetic induction, and low high-frequency loss. Summary of the Invention

[0009] Therefore, the technical problem to be solved by this invention is to overcome the main problem of nickel-zinc ferrite materials in related technologies, which is difficult to simultaneously achieve high magnetic permeability, Curie temperature, saturation magnetic induction intensity, and low high-frequency loss. Thus, this invention provides a nickel-zinc ferrite material, its preparation method, and its applications.

[0010] This invention provides a nickel-zinc ferrite material, the raw materials of which include: main components and secondary components;

[0011] The main components include: Fe2O3, NiO, ZnO, and CuO; Fe2O3 accounts for 64.05–68.72 wt% of the main components, NiO accounts for 14.12–17.36 wt% of the main components, ZnO accounts for 11.61–15.02 wt% of the main components, and CuO accounts for 3.82–4.45 wt% of the main components.

[0012] Based on the total weight of the main components, the secondary components include: Al2O3 0.2-0.6 wt%, SiO2 0.05-0.25 wt%, and MnO2 0.1-0.35 wt%.

[0013] The present invention also provides a method for preparing the above-mentioned nickel-zinc ferrite material, comprising the following steps:

[0014] (1) Fe2O3, NiO, ZnO, CuO and water are mixed by sand milling, dried and pre-calcined to obtain pre-calcined material;

[0015] (2) The pre-calcined material, Al2O3, SiO2, MnO2 and water are mixed by secondary sand milling, dried and dispersed to obtain mixed pre-calcined material;

[0016] (3) Mix the pre-calcined material, binder and defoamer, and granulate to obtain the initial granules;

[0017] (4) The initial granules and lubricant are mixed, pressed into shape, and sintered to obtain the nickel-zinc ferrite material.

[0018] Preferably, the sand milling and mixing process in step (1) is carried out in a sand mill.

[0019] Preferably, the sand milling and mixing time in step (1) is 0.5-2 hours;

[0020] Preferably, in step (1), the mass ratio of the total weight of Fe2O3, NiO, ZnO and CuO, the mass of the grinding balls and the mass of water in the sand milling mixture is (0.8-1.2):(4-5):(0.6-1);

[0021] Preferably, the preheating temperature in step (1) is 800-1000℃ and the holding time is 3-7h.

[0022] Preferably, the pre-firing process in step (1) also includes a heating process; the heating process involves heating the dried material to the pre-firing temperature for 2-4 hours.

[0023] Preferably, the pre-firing process in step (1) is followed by a cooling process.

[0024] Preferably, in step (2), the secondary sand milling and mixing process is carried out in a sand mill;

[0025] Preferably, the sand milling mixing time in step (2) is 1 to 3 hours;

[0026] Preferably, the particle size of the material after sand milling in step (2) is 0.4 to 1.3 μm;

[0027] Preferably, the mass ratio of the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the grinding balls and water is (0.8-1.2):(3.5-4.5):(0.8-1.2).

[0028] Preferably, in step (3), the mass ratio of the pre-burned material, binder and defoamer is (85-100):(8-12):(0.01-0.1);

[0029] Preferably, the adhesive is selected from polyvinyl alcohol;

[0030] Preferably, the defoamer is selected from n-octanol.

[0031] Preferably, the granulation process is centrifugal spray granulation;

[0032] Preferably, the initial particle size of the granulated material is 50-250 μm.

[0033] Preferably, in step (4), the initial mass ratio of granules to lubricant is (80-120):(0.08-0.12);

[0034] Preferably, the lubricant is selected from zinc stearate.

[0035] Preferably, the compression molding pressure is 4-6 MPa.

[0036] Preferably, the density of the blank after pressing is 3.05–3.25 g / cm³. 3 .

[0037] Preferably, in step (4), the sintering temperature is 1040-1130℃ and the sintering time is 3-5h;

[0038] Preferably, the atmosphere during the sintering process is air.

[0039] Preferably, in step (4), after pressing and forming and before sintering, a heating process with a heating rate of 2 to 5 °C / min is also included;

[0040] Preferably, in step (4), after sintering, there is also a cooling process at a cooling rate of 3 to 5 °C / min.

[0041] The present invention also provides an application of the nickel-zinc ferrite material described above or the nickel-zinc ferrite material prepared by the preparation method described above in high-frequency inductors, filters, transformers, high-frequency antennas, and shortwave high-frequency communication equipment.

[0042] The technical solution of this invention has the following advantages:

[0043] This invention provides a nickel-zinc ferrite material, the raw materials of which include: a main component and secondary components; wherein the main component includes: Fe2O3, NiO, ZnO, and CuO; Fe2O3 accounts for 64.05-68.72 wt% of the main component by mass, NiO accounts for 14.12-17.36 wt% of the main component by mass, ZnO accounts for 11.61-15.02 wt% of the main component by mass, and CuO accounts for 3.82-4.45 wt% of the main component by mass; the secondary components, based on the total weight of the main component, include: Al2O3 0.2-0.6 wt%, SiO2 0.05-0.25 wt%, and MnO2 0.1-0.35 wt%.

[0044] In the nickel-zinc ferrite material of this invention, the addition of CuO can achieve the purpose of lowering the sintering temperature and improving the densification of the material, which can reduce the sintering temperature to below 1130℃ while ensuring good magnetic properties; MnO2 can improve the overall performance of the material, especially by reducing coercivity and hysteresis loss, thereby reducing the total core loss, and also increasing the resistivity inside the grains; SiO2 can increase the stress insensitivity of the material, reduce the disadvantage of low-temperature sintered NiCuZn ferrite being sensitive to compressive stress, and reduce core loss; the addition of Al2O3 is beneficial for increasing the grain boundary thickness and inhibiting grain growth. Increasing the Curie temperature and saturation flux density can also improve the Q value of the material, thereby reducing losses. By selecting specific main and secondary components and limiting their respective contents, a synergistic effect is achieved among the components, ultimately resulting in a nickel-zinc ferrite material with excellent comprehensive performance (magnetic permeability 200±25%, Curie temperature greater than 300℃, Bs (4000A / m) greater than 485mT, relative loss factor tanδ / μi (×10^-6): <32 (f=1MHz)). This material can be applied to high-precision high-frequency inductors, filters, transformers, high-frequency antennas, and shortwave high-frequency communication equipment. Detailed Implementation

[0045] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0046] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0047] The polyvinyl alcohol (PVA) used in the examples and comparative examples has a molecular weight of 13,000-23,000.

[0048] Example 1

[0049] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0050] (1) Weigh the main components of the raw materials: Fe2O3 66.4g, NiO 16.35g, ZnO 13.15g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.4g, MnO2 0.3g;

[0051] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0052] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill for 2 hours (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain mixed pre-burned material;

[0053] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0054] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0055] Example 2

[0056] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0057] (1) Weigh the main components of the raw materials: Fe2O3 64.3g, NiO 17.31g, ZnO 13.96g, CuO 4.43g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.4g, MnO2 0.3g;

[0058] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0059] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0060] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0061] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0062] Example 3

[0063] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0064] (1) Weigh the main components of the raw materials: Fe2O3 68.66g, NiO 14.46g, ZnO 11.86g, CuO 4.02g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.5g, MnO2 0.35g;

[0065] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0066] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0067] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0068] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0069] Example 4

[0070] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0071] (1) Weigh the main components of the raw materials: Fe2O3 66.9g, NiO 15.5g, ZnO 13.5g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.4g, MnO2 0.3g;

[0072] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0073] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0074] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0075] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0076] Example 5

[0077] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0078] (1) Weigh the main components of the raw materials: Fe2O3 67.15g, NiO 15.37g, ZnO 13.38g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.4g, MnO2 0.3g;

[0079] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0080] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0081] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0082] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0083] Example 6

[0084] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0085] (1) Weigh the main components of the raw materials: Fe2O3 66.28g, NiO 16.78g, ZnO 12.84g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.4g, MnO2 0.3g;

[0086] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0087] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0088] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0089] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0090] Example 7

[0091] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0092] (1) Weigh the main components of the raw materials: Fe2O3 65.75g, NiO 16.59g, ZnO 13.46g, CuO 4.2g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.4g, MnO2 0.25g;

[0093] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0094] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0095] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0096] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0097] Example 8

[0098] This embodiment provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0099] (1) Weigh the main components of the raw materials: Fe2O3 65.55g, NiO 16.15g, ZnO 14.2g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.3g, MnO2 0.3g;

[0100] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0101] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0102] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0103] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0104] Comparative Example 1

[0105] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0106] (1) Weigh the main components of the raw materials: Fe2O3 66.6g, NiO 17.84g, ZnO 11.51g, CuO 4.05g, and weigh the secondary components: SiO2 0.1g, Al2O3 0.5g, MnO2 0.3g;

[0107] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0108] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0109] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0110] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0111] Comparative Example 2

[0112] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0113] (1) Weigh the main components of the raw materials: Fe2O3 68.96g, NiO 14.75g, ZnO 12.55g, CuO 3.86g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.4g, MnO2 0.3g;

[0114] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0115] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0116] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0117] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0118] Comparative Example 3

[0119] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0120] (1) Weigh the main components of the raw materials: Fe2O3 66.2g, NiO 16.35g, ZnO 12.95g, CuO 4.5g, and weigh the secondary components: SiO2 0.25g, Al2O3 0.3g, MnO2 0.05g;

[0121] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0122] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0123] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0124] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0125] Comparative Example 4

[0126] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0127] (1) Weigh the main components of the raw materials: Fe2O3 66.4g, NiO 14.05g, ZnO 15.45g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.25g, MnO2 0.3g;

[0128] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0129] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0130] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0131] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0132] Comparative Example 5

[0133] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0134] (1) Weigh the main components of the raw materials: Fe2O3 63.96g, NiO 16.35g, ZnO 15.59g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.2g, MnO2 0.3g;

[0135] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0136] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0137] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0138] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0139] Comparative Example 6

[0140] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0141] (1) Weigh the main components of the raw materials: Fe2O3 66.4g, NiO 16.35g, ZnO 13.15g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.1g, MnO2 1.05g;

[0142] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0143] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0144] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0145] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0146] Comparative Example 7

[0147] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0148] (1) Weigh the main components of the raw materials: Fe2O3 65.55g, NiO 16.15g, ZnO 14.2g, CuO 4.1g, and weigh the secondary components: SiO2 0.2g, Al2O3 0.1g, MnO2 0.4g;

[0149] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0150] (3) The pre-burned material and the SiO2, Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0151] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0152] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0153] Comparative Example 8

[0154] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0155] (1) Weigh the main components of the raw materials: Fe2O3 66.4g, NiO 16.35g, ZnO 13.15g, CuO 4.1g, and weigh the secondary components: Al2O3 0.51g, MnO2 0.39g;

[0156] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0157] (3) The pre-burned material and the Al2O3, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0158] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0159] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0160] Comparative Example 9

[0161] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0162] (1) Weigh the main components of the raw materials: Fe2O3 66.4g, NiO 16.35g, ZnO 13.15g, CuO 4.1g, and weigh the secondary components: SiO2 0.36g, MnO2 0.54g;

[0163] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0164] (3) The pre-burned material and the SiO2, MnO2 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, SiO2 and MnO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain a mixed pre-burned material.

[0165] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0166] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0167] Comparative Example 10

[0168] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0169] (1) Weigh the main components of the raw materials: Fe2O3 66.4g, NiO 16.35g, ZnO 13.15g, CuO 4.1g, and weigh the secondary components: SiO2 0.3g, Al2O3 0.5g;

[0170] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0171] (3) The pre-burned material and the SiO2, Al2O3 and water weighed in step (1) are sand-milled in a sand mill (the total weight of the pre-burned material, Al2O3 and SiO2, the mass ratio of the grinding balls and water is 1:4:1). The resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain mixed pre-burned material.

[0172] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0173] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3 The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0174] Comparative Example 11

[0175] This comparative example provides a nickel-zinc ferrite material, the preparation method of which includes the following steps:

[0176] (1) Weigh the main components of the raw materials: Fe2O3 66.4g, NiO 16.35g, ZnO 13.15g, CuO 4.1g;

[0177] (2) The main components of the raw material and water are mixed in a sand mill (the mass ratio of the main components, grinding balls and water is 1:4.5:0.8), crushed for 1.5 hours and dried. After that, the temperature is raised to 890±10℃ for 4 hours and kept at that temperature for 4 hours. Then, the material is cooled to obtain the pre-burned material.

[0178] (3) After grinding the pre-burned material and water in a sand mill (the mass ratio of pre-burned material weight, grinding balls and water is 1:4:1), the resulting material (particle size of 0.5-1.2μm (the particle size of the material is normally distributed)) is dried, ground and dispersed to obtain mixed pre-burned material;

[0179] (4) 100g of mixed pre-burned material, 10g of PVA and 0.05g of n-octanol were centrifugally sprayed through a spray tower to obtain initial granules with a particle size of 50-250μm.

[0180] (5) The initial granules and zinc stearate were mixed at a mass ratio of 100:0.1 and then pressed into a powder molding machine with a molding pressure of 5 MPa to a density of 3.15 g / cm³. 3The blank is then heated to 1100℃ in an air atmosphere in a roller kiln, held for 4 hours, and then cooled at 3℃ / min to obtain the nickel-zinc ferrite material.

[0181] Test case

[0182] The nickel-zinc ferrite materials prepared in the examples and comparative examples were used to fabricate sample rings with an outer diameter of 25 mm, an inner diameter of 15 mm, and a height of 7 mm. The inductance and Q value were tested using an Aglient E4980A tester. Test conditions: Φ0.35 mm enameled wire, 20 turns, T = 25℃, u = 0.25 V, F = 1 kHz ~ 2 MHz;

[0183] The Curie temperature Tc and the inductance at each temperature were tested using an Aglient E4980A and a high-low temperature controllable oven. Based on the inductance and Q value data, μi and the relative loss factor were calculated.

[0184] The magnetic flux density Bs was measured using the SY8232 instrument from Iwasaki Corporation, Japan.

[0185] The surface resistance was tested using an SM-8220 test instrument. The insulation resistance R between the two ends of a Ф10*2mm diameter was measured using an Agilent 4339B high-resistivity meter, and the resistivity ρ was calculated.

[0186] Permeability is a measure of the magnetization a material acquires in response to an applied magnetic field. In the electronics industry, it is represented by μi. Permeability represents the inductance per unit length and is calculated by measuring the inductance of a magnetic core.

[0187]

[0188] Where L: inductance of the coil with a magnetic core (H); Lo: inductance of the coil without a magnetic core (H); N: number of turns of the coil; Ae: effective cross-sectional area of ​​the magnetic core (cm²) 2 Le: Effective magnetic path length of the magnetic core (cm).

[0189] The relative loss factor (tanδ / μi) is the ratio of the loss factor to the permeability. The lower the value, the smaller the material loss and the higher the electromagnetic performance. It is calculated using the following formula:

[0190] tanδ / μi=1 / (Q×μi)

[0191] tanδ is the core loss, which is the reciprocal of the quality factor Q (tanδ = 1 / Q).

[0192] μi is the magnetic permeability;

[0193] The test or calculation results are shown in Table 1:

[0194] Table 1

[0195]

[0196]

[0197] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A nickel-zinc ferrite material, characterized in that, The raw materials consist of: main components and secondary components; The main components are Fe2O3, NiO, ZnO, and CuO; Fe2O3 accounts for 64.05~68.72 wt% of the main components, NiO accounts for 14.12~17.36 wt%, ZnO accounts for 11.61~15.02 wt%, and CuO accounts for 3.82~4.45 wt%. Based on the total weight of the main components, the secondary components are: Al2O3 0.2~0.6wt%, SiO2 0.05~0.25wt%, MnO2 0.1~0.35wt%; Its preparation method includes the following steps: (1) Fe2O3, NiO, ZnO, CuO and water are mixed by sand milling, dried and pre-calcined to obtain pre-calcined material; (2) The pre-burned material, Al2O3, SiO2, MnO2 and water are mixed by secondary sand milling, dried and dispersed to obtain mixed pre-burned material; (3) Mix the pre-fired material, binder and defoamer, and granulate to obtain the initial granular material; (4) The initial granules and lubricant are mixed, pressed into shape, and sintered to obtain the nickel-zinc ferrite material.

2. A method for preparing the nickel-zinc ferrite material according to claim 1, characterized in that, Includes the following steps: (1) Fe2O3, NiO, ZnO, CuO and water are mixed by sand milling, dried and pre-calcined to obtain pre-calcined material; (2) The pre-burned material, Al2O3, SiO2, MnO2 and water are mixed by secondary sand milling, dried and dispersed to obtain mixed pre-burned material; (3) Mix the pre-fired material, binder and defoamer, and granulate to obtain the initial granular material; (4) The initial granules and lubricant are mixed, pressed into shape, and sintered to obtain the nickel-zinc ferrite material; In step (1), the preheating temperature is 800-1000℃ and the holding time is 3-7h; In step (4), the sintering temperature is 1040~1130℃ and the sintering time is 3~5h.

3. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The first sand milling and mixing process in step (1) is carried out in a sand mill.

4. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The sand milling mixing time in step (1) is 0.5-2h.

5. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (1), the total weight of Fe2O3, NiO, ZnO and CuO, the mass ratio of grinding balls and water in the sand milling mixture is (0.8-1.2):(4-5):(0.6-1).

6. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (2), the secondary sand milling and mixing process is carried out in a sand mill.

7. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (2), the sand milling time is 1~3h.

8. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The particle size of the material after sand milling in step (2) is 0.4 to 1.3 μm.

9. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (2), the total weight of the pre-burned material, Al2O3, SiO2 and MnO2, the mass ratio of the grinding balls and water is (0.8-1.2):(3.5-4.5):(0.8-1.2).

10. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (3), the mass ratio of the pre-burned material, binder and defoamer is (85-100): (8-12): (0.01-0.1).

11. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The adhesive is selected from polyvinyl alcohol.

12. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The defoamer is selected from n-octanol.

13. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The granulation process is centrifugal spray granulation.

14. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The initial particle size of the granulated material is 50-250μm.

15. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (4), the initial mass ratio of granules to lubricant is (80-120): (0.08-0.12).

16. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The lubricant is selected from zinc stearate.

17. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The density of the pressed blank is 3.05~3.25 g / cm³. 3 .

18. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, The atmosphere during the sintering process is air.

19. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (4), after pressing and forming, before sintering, there is a heating process with a heating rate of 2~5℃ / min.

20. The method for preparing the nickel-zinc ferrite material according to claim 2, characterized in that, In step (4), after sintering, there is also a cooling process at a cooling rate of 3~5℃ / min.

21. The application of the nickel-zinc ferrite material according to claim 1 or the nickel-zinc ferrite material prepared by the preparation method according to any one of claims 2-20 in high-frequency inductors, filters, transformers, high-frequency antennas, and shortwave high-frequency communication equipment.

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